Solution : https://service.sap.com/sap/support/notes/608573 (SAP Service marketplace login required)
Key words : 
ora_nls33=/oracle/client/81x_<32_or_64>/ocommon/nls/admin/data  export ora_nls33to make, /oracle/client/81x_/ocommon/nls/admin/data, /oracle/client/920_32/lib 64-bit oracle db software, directory /oracle/<dbsid>/920_<bit>/805_<bit>, sap backup library legato storage manager backup tool, raw devices' / 'oracle file systems'space requirements, /usr/sap/<sapsid>/sys/exe/run/saposcol, load library      '/sapmnt/<sapsid>/exe/dboraslib, cd /oracle/stage/920_32/disk1/sap, cd /oracle/stage/920_64/disk1/sap
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